there s just a problem, people would complain it's too "physical" for them to move their arms constantly. Nothing beats mouse or trackball + keyboard. The only interesting progress would be to make transparent, hologram like ... keyboards and trackballs. But seriously..moving your arms ? think about it. Also let's not forget the fiasco the wii and its controllers were... even if it sold well, it is still garbage nobody wants to use anymore but little kids.